King James Version
And after that went the Levites in to do their service in the tabernacle of the congregation before Aaron, and before his sons: as the LORD had commanded Moses concerning the Levites, so did they unto them.New International Version
After that, the Levites came to do their work at the Tent of Meeting under the supervision of Aaron and his sons. They did with the Levites just as the LORD commanded Moses.Catholic Public Domain Version
so that, having been purified, they might enter to their duties in the tabernacle of the covenant before Aaron and his sons. Just as the Lord had instructed Moses about the Levites, so was it done